1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "mesh_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 50 #include "mesh/beacon.h" 51 #include "mesh/mesh_iv_index_seq_number.h" 52 #include "mesh/mesh_keys.h" 53 #include "mesh/mesh_lower_transport.h" 54 #include "mesh/mesh_peer.h" 55 #include "mesh/mesh_virtual_addresses.h" 56 57 // TODO: extract mesh_pdu functions into lower transport or network 58 #include "mesh/mesh_access.h" 59 60 static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 61 62 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 63 printf("%-20s ", name); 64 printf_hexdump(data, len); 65 } 66 // static void mesh_print_x(const char * name, uint32_t value){ 67 // printf("%20s: 0x%x", name, (int) value); 68 // } 69 70 71 // combined key x address iterator for upper transport decryption 72 73 typedef struct { 74 // state 75 mesh_transport_key_iterator_t key_it; 76 mesh_virtual_address_iterator_t address_it; 77 // elements 78 const mesh_transport_key_t * key; 79 const mesh_virtual_address_t * address; 80 // address - might be virtual 81 uint16_t dst; 82 // key info 83 } mesh_transport_key_and_virtual_address_iterator_t; 84 85 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 86 uint16_t dst, uint16_t netkey_index, uint8_t akf, 87 uint8_t aid) { 88 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 89 // config 90 it->dst = dst; 91 // init elements 92 it->key = NULL; 93 it->address = NULL; 94 // init element iterators 95 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 96 // init address iterator 97 if (mesh_network_address_virtual(it->dst)){ 98 mesh_virtual_address_iterator_init(&it->address_it, dst); 99 // get first key 100 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 101 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 102 } 103 } 104 } 105 106 // cartesian product: keys x addressses 107 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 108 if (mesh_network_address_virtual(it->dst)) { 109 // find next valid entry 110 while (true){ 111 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 112 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 113 // get next key 114 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 115 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 116 } 117 } else { 118 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 119 } 120 } 121 122 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 123 if (mesh_network_address_virtual(it->dst)) { 124 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 125 } else { 126 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 127 } 128 } 129 130 // UPPER TRANSPORT 131 132 // stub lower transport 133 134 static void mesh_upper_transport_validate_unsegmented_message(void); 135 static void mesh_upper_transport_validate_segmented_message(void); 136 137 static void mesh_upper_transport_run(void); 138 139 static int crypto_active; 140 static mesh_access_incoming_pdu_t * incoming_unsegmented_pdu_raw; 141 static mesh_network_pdu_t * incoming_network_pdu_decoded; 142 static mesh_transport_pdu_t incoming_transport_pdu_singleton; 143 static mesh_transport_pdu_t * incoming_transport_pdu_raw; 144 static mesh_transport_pdu_t * incoming_transport_pdu_decoded; 145 static mesh_message_pdu_t incoming_message_pdu_singleton; 146 static uint8_t application_nonce[13]; 147 static btstack_crypto_ccm_t ccm; 148 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 149 150 // upper transport callbacks - in access layer 151 static void (*mesh_access_message_handler)(mesh_pdu_t * pdu); 152 static void (*mesh_control_message_handler)(mesh_pdu_t * pdu); 153 154 // incoming unsegmented (network) and segmented (transport) control and access messages 155 static btstack_linked_list_t upper_transport_incoming; 156 157 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 158 static btstack_linked_list_t upper_transport_outgoing; 159 160 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 161 printf("List: %s:\n", name); 162 btstack_linked_list_iterator_t it; 163 btstack_linked_list_iterator_init(&it, list); 164 while (btstack_linked_list_iterator_has_next(&it)){ 165 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 166 printf("- %p\n", pdu); 167 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 168 } 169 } 170 171 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 172 while (!btstack_linked_list_empty(list)){ 173 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 174 } 175 } 176 177 void mesh_upper_transport_dump(void){ 178 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 179 printf("incoming_network_pdu_decoded: %p\n", incoming_network_pdu_decoded); 180 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 181 } 182 183 void mesh_upper_transport_reset(void){ 184 crypto_active = 0; 185 if (incoming_unsegmented_pdu_raw){ 186 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_unsegmented_pdu_raw->segments); 187 btstack_assert(network_pdu != NULL); 188 mesh_network_pdu_free(network_pdu); 189 incoming_unsegmented_pdu_raw = NULL; 190 } 191 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 192 } 193 194 static void mesh_upper_unsegmented_control_message_received(mesh_network_pdu_t * network_pdu){ 195 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 196 uint8_t opcode = lower_transport_pdu[0]; 197 if (mesh_control_message_handler){ 198 mesh_control_message_handler((mesh_pdu_t*) network_pdu); 199 } else { 200 printf("[!] Unhandled Control message with opcode %02x\n", opcode); 201 // done 202 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 203 } 204 } 205 206 static void mesh_upper_transport_process_message_done(mesh_message_pdu_t *message_pdu){ 207 crypto_active = 0; 208 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 209 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 210 if (mesh_network_control(network_pdu)) { 211 btstack_assert(0); 212 } else { 213 btstack_assert(network_pdu != NULL); 214 mesh_network_pdu_free(network_pdu); 215 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 216 incoming_unsegmented_pdu_raw = NULL; 217 mesh_lower_transport_message_processed_by_higher_layer(pdu); 218 } 219 mesh_upper_transport_run(); 220 } 221 222 static void mesh_upper_transport_process_unsegmented_message_done(mesh_network_pdu_t *network_pdu){ 223 crypto_active = 0; 224 if (mesh_network_control(network_pdu)) { 225 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); 226 } else { 227 btstack_assert(network_pdu != NULL); 228 mesh_network_pdu_free(network_pdu); 229 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 230 incoming_unsegmented_pdu_raw = NULL; 231 incoming_unsegmented_pdu_raw = NULL; 232 mesh_lower_transport_message_processed_by_higher_layer(pdu); 233 } 234 mesh_upper_transport_run(); 235 } 236 237 static void mesh_upper_transport_process_segmented_message_done(mesh_transport_pdu_t *transport_pdu){ 238 crypto_active = 0; 239 if (mesh_transport_ctl(transport_pdu)) { 240 btstack_assert(0); 241 } else { 242 mesh_transport_pdu_free(transport_pdu); 243 incoming_transport_pdu_raw = NULL; 244 } 245 mesh_upper_transport_run(); 246 } 247 248 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 249 // get IV Index and IVI 250 uint32_t iv_index = mesh_get_iv_index(); 251 int ivi = ivi_nid >> 7; 252 253 // if least significant bit differs, use previous IV Index 254 if ((iv_index & 1 ) ^ ivi){ 255 iv_index--; 256 } 257 return iv_index; 258 } 259 260 static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 261 nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats 262 (void)memcpy(&nonce[2], &network_pdu->data[2], 7); 263 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); 264 } 265 266 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 267 nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00; 268 (void)memcpy(&nonce[2], &transport_pdu->network_header[2], 7); 269 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0])); 270 } 271 272 static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 273 nonce[0] = 0x01; 274 transport_unsegmented_setup_nonce(nonce, network_pdu); 275 mesh_print_hex("AppNonce", nonce, 13); 276 } 277 278 static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 279 nonce[0] = 0x02; 280 transport_unsegmented_setup_nonce(nonce, network_pdu); 281 mesh_print_hex("DeviceNonce", nonce, 13); 282 } 283 284 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 285 nonce[0] = 0x01; 286 transport_segmented_setup_nonce(nonce, transport_pdu); 287 mesh_print_hex("AppNonce", nonce, 13); 288 } 289 290 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ 291 nonce[0] = 0x02; 292 transport_segmented_setup_nonce(nonce, transport_pdu); 293 mesh_print_hex("DeviceNonce", nonce, 13); 294 } 295 296 static void mesh_upper_transport_validate_unsegmented_message_ccm(void * arg){ 297 UNUSED(arg); 298 299 uint8_t * lower_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded); 300 uint8_t trans_mic_len = 4; 301 302 // store TransMIC 303 uint8_t trans_mic[8]; 304 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 305 mesh_print_hex("TransMIC", trans_mic, trans_mic_len); 306 307 uint8_t * upper_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded) + 1; 308 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(incoming_network_pdu_decoded) - 1; 309 310 mesh_print_hex("Decryted PDU", upper_transport_pdu, upper_transport_pdu_len - trans_mic_len); 311 312 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len - trans_mic_len], trans_mic_len) == 0){ 313 printf("TransMIC matches\n"); 314 315 // remove TransMIC from payload 316 incoming_network_pdu_decoded->len -= trans_mic_len; 317 318 // if virtual address, update dst to pseudo_dst 319 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 320 big_endian_store_16(incoming_network_pdu_decoded->data, 7, mesh_transport_key_it.address->pseudo_dst); 321 } 322 323 // pass to upper layer 324 if (mesh_access_message_handler){ 325 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_network_pdu_decoded; 326 incoming_network_pdu_decoded = NULL; 327 mesh_access_message_handler((mesh_pdu_t*) &incoming_message_pdu_singleton); 328 } else { 329 printf("[!] Unhandled Unsegmented Access message\n"); 330 // done 331 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 332 } 333 334 printf("\n"); 335 } else { 336 uint8_t afk = lower_transport_pdu[0] & 0x40; 337 if (afk){ 338 printf("TransMIC does not match, try next key\n"); 339 mesh_upper_transport_validate_unsegmented_message(); 340 } else { 341 printf("TransMIC does not match device key, done\n"); 342 // done 343 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 344 } 345 } 346 } 347 348 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 349 UNUSED(arg); 350 351 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 352 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 353 354 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 355 356 // store TransMIC 357 uint8_t trans_mic[8]; 358 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 359 mesh_print_hex("TransMIC", trans_mic, incoming_transport_pdu_decoded->transmic_len); 360 361 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_transport_pdu_decoded->transmic_len) == 0){ 362 printf("TransMIC matches\n"); 363 364 // remove TransMIC from payload 365 incoming_transport_pdu_decoded->len -= incoming_transport_pdu_decoded->transmic_len; 366 367 // if virtual address, update dst to pseudo_dst 368 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 369 big_endian_store_16(incoming_transport_pdu_decoded->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 370 } 371 372 // pass to upper layer 373 if (mesh_access_message_handler){ 374 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_transport_pdu_decoded; 375 incoming_network_pdu_decoded = NULL; 376 mesh_access_message_handler(pdu); 377 } else { 378 printf("[!] Unhandled Segmented Access/Control message\n"); 379 // done 380 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 381 } 382 383 printf("\n"); 384 385 } else { 386 uint8_t akf = incoming_transport_pdu_decoded->akf_aid_control & 0x40; 387 if (akf){ 388 printf("TransMIC does not match, try next key\n"); 389 mesh_upper_transport_validate_segmented_message(); 390 } else { 391 printf("TransMIC does not match device key, done\n"); 392 // done 393 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 394 } 395 } 396 } 397 398 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 399 crypto_active = 0; 400 switch (pdu->pdu_type){ 401 case MESH_PDU_TYPE_NETWORK: 402 mesh_upper_transport_process_unsegmented_message_done((mesh_network_pdu_t *) pdu); 403 break; 404 case MESH_PDU_TYPE_TRANSPORT: 405 mesh_upper_transport_process_segmented_message_done((mesh_transport_pdu_t *) pdu); 406 break; 407 case MESH_PDU_TYPE_MESSAGE: 408 mesh_upper_transport_process_message_done((mesh_message_pdu_t *) pdu); 409 break; 410 default: 411 break; 412 } 413 } 414 415 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 416 UNUSED(arg); 417 uint8_t upper_transport_pdu_len = incoming_transport_pdu_raw->len - incoming_transport_pdu_raw->transmic_len; 418 uint8_t * upper_transport_pdu_data_in = incoming_transport_pdu_raw->data; 419 uint8_t * upper_transport_pdu_data_out = incoming_transport_pdu_decoded->data; 420 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); 421 } 422 423 static void mesh_upper_transport_validate_unsegmented_message_digest(void * arg){ 424 UNUSED(arg); 425 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 426 uint8_t trans_mic_len = 4; 427 uint8_t lower_transport_pdu_len = network_pdu->len - 9; 428 uint8_t * upper_transport_pdu_data_in = &network_pdu->data[10]; 429 uint8_t * upper_transport_pdu_data_out = &incoming_network_pdu_decoded->data[10]; 430 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 431 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_unsegmented_message_ccm, NULL); 432 } 433 434 static void mesh_upper_transport_validate_unsegmented_message(void){ 435 436 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 437 printf("No valid transport key found\n"); 438 mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); 439 return; 440 } 441 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 442 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 443 444 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 445 if (message_key->akf){ 446 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 447 } else { 448 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 449 } 450 451 // store application / device key index 452 mesh_print_hex("AppOrDevKey", message_key->key, 16); 453 incoming_message_pdu_singleton.appkey_index = message_key->appkey_index; 454 455 // unsegmented message have TransMIC of 32 bit 456 uint8_t trans_mic_len = 4; 457 printf("Unsegmented Access message with TransMIC len 4\n"); 458 459 uint8_t lower_transport_pdu_len = network_pdu->len - 9; 460 uint8_t * upper_transport_pdu_data = &network_pdu->data[10]; 461 uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; 462 463 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 464 465 // decrypt ccm 466 crypto_active = 1; 467 uint16_t aad_len = 0; 468 if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ 469 aad_len = 16; 470 } 471 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len); 472 if (aad_len){ 473 btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, NULL); 474 } else { 475 mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded); 476 } 477 } 478 479 static void mesh_upper_transport_validate_segmented_message(void){ 480 uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data; 481 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 482 483 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 484 printf("No valid transport key found\n"); 485 mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); 486 return; 487 } 488 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 489 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 490 491 if (message_key->akf){ 492 transport_segmented_setup_application_nonce(application_nonce, incoming_transport_pdu_raw); 493 } else { 494 transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw); 495 } 496 497 // store application / device key index 498 mesh_print_hex("AppOrDevKey", message_key->key, 16); 499 incoming_transport_pdu_decoded->appkey_index = message_key->appkey_index; 500 501 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 502 503 // decrypt ccm 504 crypto_active = 1; 505 uint16_t aad_len = 0; 506 if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ 507 aad_len = 16; 508 } 509 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->transmic_len); 510 511 if (aad_len){ 512 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 513 } else { 514 mesh_upper_transport_validate_segmented_message_digest(NULL); 515 } 516 } 517 518 static void mesh_upper_transport_process_unsegmented_access_message(void){ 519 // copy original pdu 520 mesh_network_pdu_t * raw_network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&incoming_unsegmented_pdu_raw->segments); 521 incoming_network_pdu_decoded->len = raw_network_pdu->len; 522 (void)memcpy(incoming_network_pdu_decoded->data, 523 raw_network_pdu->data, 524 incoming_network_pdu_decoded->len); 525 526 // 527 uint8_t * lower_transport_pdu = &raw_network_pdu->data[9]; 528 uint8_t lower_transport_pdu_len = raw_network_pdu->len - 9; 529 530 mesh_print_hex("Lower Transport network pdu", &raw_network_pdu->data[9], lower_transport_pdu_len); 531 532 uint8_t aid = lower_transport_pdu[0] & 0x3f; 533 uint8_t akf = (lower_transport_pdu[0] & 0x40) >> 6; 534 printf("AKF: %u\n", akf); 535 printf("AID: %02x\n", aid); 536 537 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_network_dst(incoming_network_pdu_decoded), 538 incoming_network_pdu_decoded->netkey_index, akf, aid); 539 mesh_upper_transport_validate_unsegmented_message(); 540 } 541 542 static void mesh_upper_transport_process_message(void){ 543 // copy original pdu 544 (void)memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, 545 sizeof(mesh_transport_pdu_t)); 546 547 // 548 uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; 549 uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; 550 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 551 552 uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f; 553 uint8_t akf = (incoming_transport_pdu_decoded->akf_aid_control & 0x40) >> 6; 554 555 printf("AKF: %u\n", akf); 556 printf("AID: %02x\n", aid); 557 558 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_transport_dst(incoming_transport_pdu_decoded), 559 incoming_transport_pdu_decoded->netkey_index, akf, aid); 560 mesh_upper_transport_validate_segmented_message(); 561 } 562 563 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 564 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 565 mesh_upper_transport_run(); 566 } 567 568 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 569 mesh_network_pdu_t * network_pdu; 570 mesh_transport_pdu_t * transport_pdu; 571 mesh_message_pdu_t * message_pdu; 572 switch (pdu->pdu_type) { 573 case MESH_PDU_TYPE_NETWORK: 574 network_pdu = (mesh_network_pdu_t *) pdu; 575 mesh_network_pdu_free(network_pdu); 576 break; 577 case MESH_PDU_TYPE_TRANSPORT: 578 transport_pdu = (mesh_transport_pdu_t *) pdu; 579 mesh_transport_pdu_free(transport_pdu); 580 break; 581 case MESH_PDU_TYPE_MESSAGE: 582 message_pdu = (mesh_message_pdu_t *) pdu; 583 mesh_message_pdu_free(message_pdu); 584 default: 585 break; 586 } 587 } 588 589 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 590 switch (callback_type){ 591 case MESH_TRANSPORT_PDU_RECEIVED: 592 mesh_upper_transport_message_received(pdu); 593 break; 594 case MESH_TRANSPORT_PDU_SENT: 595 // notify upper layer (or just free pdu) 596 if (higher_layer_handler){ 597 higher_layer_handler(callback_type, status, pdu); 598 } else { 599 mesh_upper_transport_pdu_free(pdu); 600 } 601 mesh_upper_transport_run(); 602 break; 603 default: 604 break; 605 } 606 } 607 static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ 608 crypto_active = 0; 609 610 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 611 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 612 613 uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; 614 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 615 mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); 616 // store TransMIC 617 btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); 618 mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); 619 network_pdu->len += 4; 620 upper_transport_pdu_len += 4; 621 mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); 622 // send network pdu 623 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 624 } 625 626 static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ 627 crypto_active = 0; 628 629 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 630 mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); 631 // store TransMIC 632 btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); 633 mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); 634 transport_pdu->len += transport_pdu->transmic_len; 635 mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); 636 mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_pdu); 637 } 638 639 static uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 640 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 641 642 if (control_pdu_len > 11) return 1; 643 644 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 645 if (!network_key) return 1; 646 647 uint8_t transport_pdu_data[12]; 648 transport_pdu_data[0] = opcode; 649 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 650 uint16_t transport_pdu_len = control_pdu_len + 1; 651 652 // setup network_pdu 653 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 654 655 return 0; 656 } 657 658 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 659 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 660 661 if (control_pdu_len > 256) return 1; 662 663 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 664 if (!network_key) return 1; 665 666 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 667 transport_pdu->len = control_pdu_len; 668 transport_pdu->netkey_index = netkey_index; 669 transport_pdu->akf_aid_control = opcode; 670 transport_pdu->transmic_len = 0; // no TransMIC for control 671 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 672 mesh_transport_set_src(transport_pdu, src); 673 mesh_transport_set_dest(transport_pdu, dest); 674 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 675 676 return 0; 677 } 678 679 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 680 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 681 switch (pdu->pdu_type){ 682 case MESH_PDU_TYPE_NETWORK: 683 return mesh_upper_transport_setup_unsegmented_control_pdu((mesh_network_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 684 case MESH_PDU_TYPE_TRANSPORT: 685 return mesh_upper_transport_setup_segmented_control_pdu((mesh_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 686 case MESH_PDU_TYPE_MESSAGE: 687 btstack_assert(0); 688 break; 689 default: 690 return 1; 691 } 692 } 693 694 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, 695 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 696 697 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 698 699 // get app or device key 700 const mesh_transport_key_t * appkey; 701 appkey = mesh_transport_key_get(appkey_index); 702 if (appkey == NULL){ 703 printf("appkey_index %x unknown\n", appkey_index); 704 return 1; 705 } 706 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 707 708 // lookup network by netkey_index 709 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 710 if (!network_key) return 1; 711 712 message_pdu->appkey_index = appkey_index; 713 714 network_pdu->data[9] = akf_aid; 715 // setup network_pdu 716 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 717 return 0; 718 } 719 720 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 721 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 722 723 int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(message_pdu, netkey_index, appkey_index, ttl, src, dest); 724 if (status) return status; 725 726 // store in transport pdu 727 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 728 (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); 729 network_pdu->len = 10 + access_pdu_len; 730 return 0; 731 } 732 733 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, 734 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 735 736 // get app or device key 737 const mesh_transport_key_t *appkey; 738 appkey = mesh_transport_key_get(appkey_index); 739 if (appkey == NULL) { 740 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 741 return 1; 742 } 743 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 744 745 // lookup network by netkey_index 746 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 747 if (!network_key) return 1; 748 if (network_key == NULL) { 749 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 750 return 1; 751 } 752 753 const uint8_t trans_mic_len = szmic ? 8 : 4; 754 755 // store in transport pdu 756 transport_pdu->transmic_len = trans_mic_len; 757 transport_pdu->netkey_index = netkey_index; 758 transport_pdu->appkey_index = appkey_index; 759 transport_pdu->akf_aid_control = akf_aid; 760 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 761 mesh_transport_set_src(transport_pdu, src); 762 mesh_transport_set_dest(transport_pdu, dest); 763 mesh_transport_set_ctl_ttl(transport_pdu, ttl); 764 return 0; 765 } 766 767 768 static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 769 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 770 int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 771 if (status) return status; 772 773 // store in transport pdu 774 (void)memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); 775 transport_pdu->len = access_pdu_len; 776 return 0; 777 } 778 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 779 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 780 switch (pdu->pdu_type){ 781 case MESH_PDU_TYPE_NETWORK: 782 btstack_assert(0); 783 case MESH_PDU_TYPE_TRANSPORT: 784 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 785 case MESH_PDU_TYPE_MESSAGE: 786 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 787 default: 788 return 1; 789 } 790 } 791 792 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 793 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 794 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 795 switch (pdu->pdu_type){ 796 case MESH_PDU_TYPE_NETWORK: 797 btstack_assert(0); 798 break; 799 case MESH_PDU_TYPE_MESSAGE: 800 return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_message_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len); 801 case MESH_PDU_TYPE_TRANSPORT: 802 return mesh_upper_transport_setup_segmented_access_pdu((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); 803 default: 804 return 1; 805 } 806 } 807 808 static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ 809 mesh_message_pdu_t * message_pdu = (mesh_message_pdu_t *) arg; 810 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 811 uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; 812 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 813 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, access_pdu_data, access_pdu_data, &mesh_upper_transport_send_unsegmented_access_pdu_ccm, message_pdu); 814 } 815 816 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 817 // Device Key is fixed 818 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 819 return mesh_transport_key_get(appkey_index); 820 } 821 822 // Get key refresh state from subnet 823 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 824 if (subnet == NULL) return NULL; 825 826 // identify old and new app keys for given appkey_index 827 mesh_transport_key_t * old_key = NULL; 828 mesh_transport_key_t * new_key = NULL; 829 mesh_transport_key_iterator_t it; 830 mesh_transport_key_iterator_init(&it, netkey_index); 831 while (mesh_transport_key_iterator_has_more(&it)){ 832 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 833 if (transport_key->appkey_index != appkey_index) continue; 834 if (transport_key->old_key == 0) { 835 new_key = transport_key; 836 } else { 837 old_key = transport_key; 838 } 839 } 840 841 // if no key is marked as old, just use the current one 842 if (old_key == NULL) return new_key; 843 844 // use new key if it exists in phase two 845 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 846 return new_key; 847 } else { 848 return old_key; 849 } 850 } 851 852 static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_message_pdu_t * message_pdu){ 853 854 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&message_pdu->segments); 855 856 // if dst is virtual address, lookup label uuid and hash 857 uint16_t aad_len = 0; 858 mesh_virtual_address_t * virtual_address = NULL; 859 uint16_t dst = mesh_network_dst(network_pdu); 860 if (mesh_network_address_virtual(dst)){ 861 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 862 if (!virtual_address){ 863 printf("No virtual address register for pseudo dst %4x\n", dst); 864 btstack_memory_mesh_network_pdu_free(network_pdu); 865 return; 866 } 867 aad_len = 16; 868 big_endian_store_16(network_pdu->data, 7, virtual_address->hash); 869 } 870 871 // reserve slot 872 mesh_lower_transport_reserve_slot(); 873 874 // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order 875 uint32_t seq = mesh_sequence_number_next(); 876 mesh_network_pdu_set_seq(network_pdu, seq); 877 878 // Dump PDU 879 printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); 880 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 881 882 // setup nonce 883 uint16_t appkey_index = message_pdu->appkey_index; 884 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 885 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 886 } else { 887 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 888 } 889 890 // get app or device key 891 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); 892 mesh_print_hex("AppOrDevKey", appkey->key, 16); 893 894 // encrypt ccm 895 uint8_t trans_mic_len = 4; 896 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 897 crypto_active = 1; 898 899 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); 900 if (virtual_address){ 901 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 902 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, message_pdu); 903 } else { 904 mesh_upper_transport_send_unsegmented_access_pdu_digest(message_pdu); 905 } 906 } 907 908 static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ 909 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 910 uint16_t access_pdu_len = transport_pdu->len; 911 uint8_t * access_pdu_data = transport_pdu->data; 912 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len,access_pdu_data, access_pdu_data, &mesh_upper_transport_send_segmented_access_pdu_ccm, transport_pdu); 913 } 914 915 static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ 916 917 // if dst is virtual address, lookup label uuid and hash 918 uint16_t aad_len = 0; 919 mesh_virtual_address_t * virtual_address = NULL; 920 uint16_t dst = mesh_transport_dst(transport_pdu); 921 if (mesh_network_address_virtual(dst)){ 922 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 923 if (!virtual_address){ 924 printf("No virtual address register for pseudo dst %4x\n", dst); 925 btstack_memory_mesh_transport_pdu_free(transport_pdu); 926 return; 927 } 928 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 929 // printf_hexdump(virtual_address->label_uuid, 16); 930 aad_len = 16; 931 big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); 932 } 933 934 // get app or device key 935 uint16_t appkey_index = transport_pdu->appkey_index; 936 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); 937 if (appkey == NULL){ 938 printf("AppKey %04x not found, drop message\n", appkey_index); 939 btstack_memory_mesh_transport_pdu_free(transport_pdu); 940 return; 941 } 942 943 // reserve slot 944 mesh_lower_transport_reserve_slot(); 945 946 // reserve one sequence number, which is also used to encrypt access payload 947 uint32_t seq = mesh_sequence_number_next(); 948 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 949 mesh_transport_set_seq(transport_pdu, seq); 950 951 // Dump PDU 952 printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu)); 953 mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); 954 955 // setup nonce - uses dst, so after pseudo address translation 956 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 957 transport_segmented_setup_device_nonce(application_nonce, transport_pdu); 958 } else { 959 transport_segmented_setup_application_nonce(application_nonce, transport_pdu); 960 } 961 962 // Dump key 963 mesh_print_hex("AppOrDevKey", appkey->key, 16); 964 965 // encrypt ccm 966 uint8_t transmic_len = transport_pdu->transmic_len; 967 uint16_t access_pdu_len = transport_pdu->len; 968 crypto_active = 1; 969 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 970 if (virtual_address){ 971 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 972 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); 973 } else { 974 mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); 975 } 976 } 977 978 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 979 // reserve slot 980 mesh_lower_transport_reserve_slot(); 981 // reserve sequence number 982 uint32_t seq = mesh_sequence_number_next(); 983 mesh_network_pdu_set_seq(network_pdu, seq); 984 // Dump PDU 985 uint8_t opcode = network_pdu->data[9]; 986 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 987 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 988 // send 989 mesh_lower_transport_send_pdu((mesh_pdu_t *) network_pdu); 990 } 991 992 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 993 // reserve slot 994 mesh_lower_transport_reserve_slot(); 995 // reserve sequence number 996 uint32_t seq = mesh_sequence_number_next(); 997 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 998 mesh_transport_set_seq(transport_pdu, seq); 999 // Dump PDU 1000 uint8_t opcode = transport_pdu->data[0]; 1001 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 1002 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 1003 // send 1004 mesh_lower_transport_send_pdu((mesh_pdu_t *) transport_pdu); 1005 } 1006 1007 static void mesh_upper_transport_run(void){ 1008 1009 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 1010 1011 if (crypto_active) return; 1012 1013 // peek at next message 1014 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); 1015 mesh_network_pdu_t * network_pdu; 1016 mesh_transport_pdu_t * transport_pdu; 1017 mesh_message_pdu_t * message_pdu; 1018 mesh_access_incoming_pdu_t * unsegmented_pdu; 1019 switch (pdu->pdu_type){ 1020 case MESH_PDU_TYPE_NETWORK: 1021 network_pdu = (mesh_network_pdu_t *) pdu; 1022 // control? 1023 if (mesh_network_control(network_pdu)) { 1024 (void) btstack_linked_list_pop(&upper_transport_incoming); 1025 mesh_upper_unsegmented_control_message_received(network_pdu); 1026 } else { 1027 btstack_assert(0); 1028 break; 1029 } 1030 break; 1031 case MESH_PDU_TYPE_ACCESS_INCOMING: 1032 unsegmented_pdu = (mesh_access_incoming_pdu_t *) pdu; 1033 network_pdu = (mesh_network_pdu_t *) btstack_linked_list_get_first_item(&unsegmented_pdu->segments); 1034 btstack_assert(network_pdu != NULL); 1035 // control? 1036 if (mesh_network_control(network_pdu)) { 1037 // TODO: handle unsegmented control message 1038 btstack_assert(0); 1039 break; 1040 } else { 1041 incoming_network_pdu_decoded = mesh_network_pdu_get(); 1042 if (!incoming_network_pdu_decoded) return; 1043 1044 (void) btstack_linked_list_pop(&upper_transport_incoming); 1045 incoming_unsegmented_pdu_raw = unsegmented_pdu; 1046 1047 // use pre-allocated message pdu 1048 incoming_message_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_MESSAGE; 1049 btstack_linked_list_add(&incoming_message_pdu_singleton.segments, (btstack_linked_item_t *) incoming_network_pdu_decoded); 1050 mesh_upper_transport_process_unsegmented_access_message(); 1051 } 1052 break; 1053 case MESH_PDU_TYPE_MESSAGE: 1054 message_pdu = (mesh_message_pdu_t *) pdu; 1055 uint8_t ctl = mesh_message_ctl(message_pdu); 1056 if (ctl){ 1057 printf("Ignoring Segmented Control Message\n"); 1058 (void) btstack_linked_list_pop(&upper_transport_incoming); 1059 mesh_lower_transport_message_processed_by_higher_layer(pdu); 1060 } else { 1061 incoming_transport_pdu_decoded = mesh_transport_pdu_get(); 1062 if (!incoming_transport_pdu_decoded) return; 1063 1064 // use pre-allocated transport buffer 1065 transport_pdu = &incoming_transport_pdu_singleton; 1066 incoming_transport_pdu_singleton.pdu_header.pdu_type = MESH_PDU_TYPE_TRANSPORT; 1067 1068 // flatten segmented message into mesh_transport_pdu_t 1069 1070 // assemble payload 1071 while (message_pdu->segments){ 1072 mesh_network_pdu_t * segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_pdu->segments); 1073 // get segment n 1074 uint8_t * lower_transport_pdu = mesh_network_pdu_data(segment); 1075 uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 1076 uint8_t * segment_data = &lower_transport_pdu[4]; 1077 (void)memcpy(&transport_pdu->data[seg_o * 12], segment_data, 12); 1078 } 1079 1080 // copy meta data 1081 transport_pdu->len = message_pdu->len; 1082 transport_pdu->netkey_index = message_pdu->netkey_index; 1083 transport_pdu->transmic_len = message_pdu->transmic_len; 1084 transport_pdu->akf_aid_control = message_pdu->akf_aid_control; 1085 transport_pdu->flags = message_pdu->flags; 1086 transport_pdu->message_complete = message_pdu->message_complete; 1087 transport_pdu->seq_zero = message_pdu->seq_zero; 1088 (void)memcpy(transport_pdu->network_header, message_pdu->network_header, 9); 1089 1090 mesh_print_hex("Assembled payload", transport_pdu->data, transport_pdu->len); 1091 1092 // free mesh message 1093 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 1094 1095 // get encoded transport pdu and start processing 1096 incoming_transport_pdu_raw = transport_pdu; 1097 (void) btstack_linked_list_pop(&upper_transport_incoming); 1098 mesh_upper_transport_process_message(); 1099 } 1100 break; 1101 default: 1102 break; 1103 } 1104 } 1105 1106 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1107 1108 if (crypto_active) break; 1109 1110 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1111 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1112 1113 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1114 1115 if (mesh_pdu_ctl(pdu)){ 1116 switch (pdu->pdu_type){ 1117 case MESH_PDU_TYPE_NETWORK: 1118 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1119 break; 1120 case MESH_PDU_TYPE_MESSAGE: 1121 btstack_assert(0); 1122 break; 1123 case MESH_PDU_TYPE_TRANSPORT: 1124 mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu); 1125 break; 1126 default: 1127 break; 1128 } 1129 } else { 1130 switch (pdu->pdu_type){ 1131 case MESH_PDU_TYPE_NETWORK: 1132 btstack_assert(0); 1133 break; 1134 case MESH_PDU_TYPE_MESSAGE: 1135 mesh_upper_transport_send_unsegmented_access_pdu((mesh_message_pdu_t *) pdu); 1136 break; 1137 case MESH_PDU_TYPE_TRANSPORT: 1138 mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); 1139 break; 1140 default: 1141 break; 1142 } 1143 } 1144 } 1145 } 1146 1147 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1148 mesh_access_message_handler = callback; 1149 } 1150 1151 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){ 1152 mesh_control_message_handler = callback; 1153 } 1154 1155 void mesh_upper_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ 1156 higher_layer_handler = pdu_handler; 1157 } 1158 1159 void mesh_upper_transport_init(){ 1160 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1161 } 1162 1163 // TODO: higher layer define used for assert 1164 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 1165 1166 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 1167 btstack_assert(pdu->pdu_type != MESH_PDU_TYPE_NETWORK); 1168 1169 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1170 mesh_upper_transport_run(); 1171 } 1172 1173 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 1174 if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ 1175 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 1176 } 1177 1178 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 1179 mesh_upper_transport_run(); 1180 } 1181